Difference between revisions of "Template:cpp/container/seq deduction guides"
m (templated iterator/allocator determination guarantee) |
m (Text replace - "class_template_deduction" to "class template argument deduction") |
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| − | This [[cpp/language/ | + | This [[cpp/language/class template argument deduction|deduction guide]] is provided for {{{1|}}} to allow deduction from an iterator range. {{cpp/enable_if|{{tt|InputIt}} satisfies {{concept|InputIterator}} and {{tt|Alloc}} satisfies {{concept|Allocator}}}} |
{{cpp/container/inputit_allocator_detection}} | {{cpp/container/inputit_allocator_detection}} | ||
Revision as of 10:23, 3 July 2017
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| template< class InputIt, class Alloc = std::allocator<typename std::iterator_traits<InputIt>::value_type>> |
(since C++17) | |
This deduction guide is provided for to allow deduction from an iterator range. This overload participates in overload resolution only if InputIt satisfies Template:concept and Alloc satisfies Template:concept
Note: the extent to which the library determines that a type does not satisfy LegacyInputIterator is unspecified, except that as a minimum integral types do not qualify as input iterators. Likewise, the extent to which it determines that a type does not satisfy Allocator is unspecified, except that as a minimum the member type Alloc::value_type must exist and the expression std::declval<Alloc&>().allocate(std::size_t{}) must be well-formed when treated as an unevaluated operand.
Example
#include <{{{1}}}> #include <vector> int main() { std::vector<int> v = {1, 2, 3, 4}; std:: x{v.begin(), v.end()}; // uses explicit deduction guide }
